Optical probe employing an impedance matched sub-lambda transmis

Details Optical probe employing an impedance matched sub-lambda transmis Optical probe employing an impedance matched sub-lambda transmis

1991-01-16

1992-12-01

Lee, John D.

Optical waveguides

Optical fiber waveguide with cladding

385 43, 385142, 385902, 250504H, G02B 610

Patent

active

051685388

ABSTRACT:
The present invention is an optical probe for emission of light from a region smaller than a wavelength. The optical probe includes a transmission line fed by an optic fiber and an impedance matched coupling. In a first embodiment the optical probe ends with a surface-wave transmission line including a central conductor and a coaxial dielectric. The diameter of the central conductor at the optic fiber is selected to substantially match the transmission impedance of the surface-wave transmission line to that of the optic fiber. The diameter of the central conductor decreases to a diameter smaller than the use wavelength at the tip end. The far end of the dielectric preferably includes a concavity to shape the resulting electric fields. In an alternative embodiment, the optical probe includes a coaxial transmisson line. The optic fiber includes a section having a decreasing diameter outer cladding and a section having no outer cladding. The coaxial transmission line includes a central conductor and a dielectric having a diameter substantially equal to the diameter of the core. An outer conductive layer is concentric with the two sections of the optic fiber and the dielectric. In a further alternative embodiment the impedance matched coupling includes a resonant cavity tunable to minimize the voltage standing wave ratio in the optic fiber.

REFERENCES:
patent: 4604520 (1986-08-01), Pohl
patent: 4725727 (1988-02-01), Harper et al.
patent: 4913507 (1990-04-01), Stamnitz et al.
patent: 4917462 (1990-04-01), Lewis et al.

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